三次元的な浸透流による堤防強化対策効果の発現特性

抄録

The three-dimensional seepage flow affects the safety of river levees because of micro topography, such as the higher hydraulic gradient observed around a pervious zone in the foundation. This paper focuses on the performance of countermeasures for seepage induced failure considering the three-dimensional seepage flow.

The two/three-dimensional seepage analyses are conducted for the cases with/without the permeable zone in the foundation, and compared the performance of countermeasures for the safety factor for slope failures and the hydraulic gradient for pipings. The results clearly show the difference in the results of the two and the three dimensions. The results of three dimensional seepage analyses illustrate transient zones, where the performance of countermeasures is less than the results of two dimensional seepage analyses because of seepage in the lateral direction. Moreover, it is indicated that the permeable zone in the foundation also have an influence on the performance by three-dimensional seepage.